import textwrap
from pathlib import Path
from typing import List, Optional

BASE_HEADER = """# Auto-generated Dockerfile (do not edit manually)
FROM ghcr.io/astral-sh/uv:python3.11-bookworm-slim

WORKDIR /app/_backend

# Install system deps (adjust as needed)
RUN apt-get update && apt-get install -y --no-install-recommends git curl && rm -rf /var/lib/apt/lists/*

COPY _backend/requirements.txt .
RUN uv pip install --system -r requirements.txt
"""

FRONTEND_LAYER = """# Copy prebuilt frontend static files
WORKDIR /app
WORKDIR /app/_backend
"""

BACKEND_COPY = """# Copy backend (after frontend build to maximize caching)
COPY _backend/ .
"""

GRAPH_RAG_COPY_TEMPLATE = """# Include GraphRAG artifacts
COPY {artifact_rel_path} {container_target}
"""

FINAL_CMD = """EXPOSE 8000
CMD ["python", "api_meeting_minutes.py"]
"""

def build_dockerfile(frontend_build_cmd: str = "",
                     frontend_build_output: str = "out",
                     graphrag_artifact_paths: Optional[List[str]] = None) -> str:
    parts = [BASE_HEADER]
    parts.append(FRONTEND_LAYER)
    parts.append(BACKEND_COPY)

    if graphrag_artifact_paths:
        for p in graphrag_artifact_paths:
            rel = p.replace("\\", "/")
            parts.append(GRAPH_RAG_COPY_TEMPLATE.format(
                artifact_rel_path=rel,
                container_target=f"/app/{rel}"
            ))
    parts.append(FINAL_CMD)
    return textwrap.dedent("".join(parts))

def write_dockerfile(output_path: Path, content: str):
    output_path.write_text(content, encoding="utf-8")